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Hi Perlmonks,

I have made a perl module DNAappend.pm with a single subroutine DNAappend in order to learn the steps of making a module. Then I have written a small script i.e. joindna.pl. When I have tried to run the perl script, the command window does not show the expected result. I can't make out where I have made the mistake in the script. I know it could be a very silly question to the perl monks but I am at my wit's end to find the solution. I welcome any constructive suggestions from the perlmonks about the script and perl module.

Here goes the script joindna.pl

#!/usr/bin/perl use warnings; use strict; use DNAappend; my $a='ATGC'; my $b='TTTT'; print"\n\n"; print DNAappend($a,$b); print"\n\n"; exit;

I have written the DNAappend.pm as follows:

package DNAappend; use strict; use warnings; sub DNAappend { my ($head,$tail)=@_; return ($head.$tail) } 1;

The command window has shown the result:

C:\Users\x\Desktop>joindna.pl Undefined subroutine &main::Dnaappend called at C:\Users\x\Desktop\joi +ndna.pl line 8. C:\Users\x\Desktop>

The correct result should look like:

 ATGCTTTT

In reply to How can I define the subroutine to get the result of the appended string i.e. ATGCTTTT? by supriyoch_2008

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